Leetcode: 168. Excel Sheet Column Title

class Solution {
    fun convertToTitle(columnNumber: Int): String {
        val aCode = 64
        val dimentionNumber = 26

        val result = StringBuilder()
        var num = columnNumber
        while (num > 0) {
            val remainder = if (num % dimentionNumber == 0) dimentionNumber
                            else num % dimentionNumber
            val ch = (remainder + aCode).toChar()
            result.insert(0, ch)

            num -= remainder
            num /= dimentionNumber
        }

        return result.toString()
    }
}